Projector and image display system

Abstract

A projector modulates a light beam emitted from a light source in accordance with image information, and then projects a right-eye image and a left-eye image on a screen in a time-sharing manner. The projector includes a projection lens adapted to project the light modulated, a lens shift mechanism adapted to move the projection lens in a direction perpendicular to an optical axis, a transmitting device adapted to output an optical signal synchronous with switching between the right-eye image and the left-eye image toward the screen, and an interlocking mechanism adapted to move the transmitting device in conjunction with the lens shift mechanism.

1 . A projector adapted to modulate a light beam, which is emitted from a light source, in accordance with image information, and project the light modulated on a screen with a projection lens, the projector comprising:
 a lens shift mechanism adapted to move the projection lens in a direction perpendicular to an optical axis of the projection lens;   a transmitting device adapted to output an optical signal different from the light toward the screen; and   an interlocking mechanism adapted to move the transmitting device in conjunction with movement of the projection lens due to the lens shift mechanism.   
     
     
         2 . The projector according to  claim 1 , wherein
 the interlocking mechanism moves the transmitting device so that a location of the optical signal varies in conjunction with movement of an image projected on the screen due to the lens shift mechanism.   
     
     
         3 . The projector according to  claim 2 , wherein
 the interlocking mechanism moves the transmitting device so that the optical signal output from the transmitting device is emitted within the image moved on the screen by the lens shift mechanism.   
     
     
         4 . The projector according to  claim 1 , wherein
 the lens shift mechanism is configured to be able to move the projection lens in a predetermined direction in a plane perpendicular to the optical axis, and   the interlocking mechanism moves the transmitting device so that the direction of the output of the optical signal is changed to the predetermined direction in conjunction with movement of the projection lens toward the predetermined direction.   
     
     
         5 . The projector according to  claim 1 , wherein
 the lens shift mechanism is configured to be able to move the projection lens in two directions perpendicular to each other in a plane perpendicular to the optical axis, and   the interlocking mechanism moves the transmitting device so that the direction of the optical signal output from the transmitting device is changed in conjunction with movement of the projection lens in one of the directions.   
     
     
         6 . The projector according to  claim 1 , wherein
 the lens shift mechanism is configured to be able to move the projection lens in two directions perpendicular to each other in a plane perpendicular to the optical axis, and   the interlocking mechanism moves the transmitting device so that the direction of the output of the optical signal is changed to the two directions in conjunction with movement of the projection lens toward the two directions, respectively.   
     
     
         7 . The projector according to  claim 1 , wherein
 the projector is configured to be able to project a first image and a second image on the screen in a time-sharing manner, and   the optical signal is an optical signal synchronous with switching between the first image and the second image.   
     
     
         8 . The projector according to  claim 7 , wherein
 the first image is a right-eye image and the second image is a left-eye image.   
     
     
         9 . An image display system comprising:
 the projector according to  claim 7 ; and   an image observing spectacles including a receiving section adapted to receive the optical signal output from the transmitting device and reflected by the screen, and a shutter switched in accordance with the optical signal received by the receiving section between an open state in which a light passes through the shutter and a light blocking state in which the light is blocked by the shutter.